package net.bwie.realtime.jtp.dwd.log.function;


import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import net.bwie.realtime.jtp.utils.DateTimeUtil;
import org.apache.flink.api.common.state.ValueState;
import org.apache.flink.api.common.state.ValueStateDescriptor;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
import org.apache.flink.util.Collector;

/**
 * 使用状态state编程,对is_new字段值进行校验和收编
 */
public class AdjustIsNewProcessFunction extends KeyedProcessFunction<String,String,String> {

    //step1.声明状态
    private transient ValueState<String> firstDateState = null;

    @Override
    public void open(Configuration parameters) throws Exception {
        // step2.初始化状态
        firstDateState = getRuntimeContext().getState(
                new ValueStateDescriptor<String>("first-date", String.class)
        );
    }

    @Override
    public void processElement(String value, Context ctx, Collector<String> out) throws Exception {
        // step3.获取状态值
        String firstDate = firstDateState.value();

        //解析字段值
        JSONObject jsonObject = JSON.parseObject(value);
        String isNewValue = jsonObject.getJSONObject("common").getString("is_new");
        Long tsValue = jsonObject.getLongValue("ts");

        // todo isNew=1 --> firstDate
        if ("1".equals(isNewValue)) {
            if (null == firstDate) {
                // step4.更新状态值
                //此时is_new正确,状态值更新为第一次访问日期
                firstDateState.update(DateTimeUtil.convertLongToString(tsValue, DateTimeUtil.DATE_FORMAT));
            } else {
                // 状态值（首次访问日期）等于数据日期,不做处理
                if (!firstDate.equals(DateTimeUtil.convertLongToString(tsValue, DateTimeUtil.DATE_FORMAT))) {
                    //此时is_new错误,更新is_new字段值,设置为0
                    jsonObject.getJSONObject("common").put("is_new", "0");
                }
            }
        } else {
            // 当用户早早登录访问,当时实时应用后来处理，用户第一次访问时，firstDate为null
            if (null == firstDate) {
                //设置一个昨天日期即可
                firstDateState.update(DateTimeUtil.convertLongToString(tsValue - 86400000L, DateTimeUtil.DATE_FORMAT));
            }
        }

        // 输出数据
        out.collect(jsonObject.toJSONString());
    }

}
